Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal

There is increasing evidence that millennial-scale climate variability played an active role on orbital-scale climate changes, but the mechanism for this remains unclear. A 230Th-dated stalagmite δ18O record between 88 and 22 thousand years (ka) ago from Yongxing Cave in central China characterizes...

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Main Authors: Hubbard, Judith, Almeida, Rafael, Foster, Anna, Sapkota, Soma Nath, Bürgi, Paula, Tapponnier, Paul
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/85233
http://hdl.handle.net/10220/50430
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-852332020-09-26T21:34:46Z Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal Hubbard, Judith Almeida, Rafael Foster, Anna Sapkota, Soma Nath Bürgi, Paula Tapponnier, Paul Asian School of the Environment Earth Observatory of Singapore Himalayas Earthquakes Science::Geology::Volcanoes and earthquakes There is increasing evidence that millennial-scale climate variability played an active role on orbital-scale climate changes, but the mechanism for this remains unclear. A 230Th-dated stalagmite δ18O record between 88 and 22 thousand years (ka) ago from Yongxing Cave in central China characterizes changes in Asian monsoon (AM) strength. After removing the 65°N insolation signal from our record, the δ18O residue is strongly anti-phased with Antarctic temperature variability on sub-orbital timescales during the Marine Isotope Stage (MIS) 3. Furthermore, once the ice volume signal from Antarctic ice core records were removed and extrapolated back to the last two glacial-interglacial cycles, we observe a linear relationship for both short- and long-duration events between Asian and Antarctic climate changes. This provides the robust evidence of a link between northern and southern hemisphere climates that operates through changes in atmospheric circulation. We find that the weakest monsoon closely associated with the warmest Antarctic event always occurred during the Terminations. This finding, along with similar shifts in the opal flux record, suggests that millennial-scale events play a key role in driving the deglaciation through positive feedbacks associated with enhanced upwelling and increasing CO2. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2019-11-18T06:42:59Z 2019-12-06T16:00:02Z 2019-11-18T06:42:59Z 2019-12-06T16:00:02Z 2016 Journal Article Hubbard, J., Almeida, R., Foster, A., Sapkota, S. N., Bürgi, P., & Tapponnier, P. (2016). Structural segmentation controlled the 2015 Mw7.8 Gorkha earthquake rupture in Nepal. Geology, 44(8), 639-642. doi:10.1130/G38077.1 0091-7613 https://hdl.handle.net/10356/85233 http://hdl.handle.net/10220/50430 10.1130/G38077.1 en Geology © 2016 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. 4 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Himalayas
Earthquakes
Science::Geology::Volcanoes and earthquakes
spellingShingle Himalayas
Earthquakes
Science::Geology::Volcanoes and earthquakes
Hubbard, Judith
Almeida, Rafael
Foster, Anna
Sapkota, Soma Nath
Bürgi, Paula
Tapponnier, Paul
Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
description There is increasing evidence that millennial-scale climate variability played an active role on orbital-scale climate changes, but the mechanism for this remains unclear. A 230Th-dated stalagmite δ18O record between 88 and 22 thousand years (ka) ago from Yongxing Cave in central China characterizes changes in Asian monsoon (AM) strength. After removing the 65°N insolation signal from our record, the δ18O residue is strongly anti-phased with Antarctic temperature variability on sub-orbital timescales during the Marine Isotope Stage (MIS) 3. Furthermore, once the ice volume signal from Antarctic ice core records were removed and extrapolated back to the last two glacial-interglacial cycles, we observe a linear relationship for both short- and long-duration events between Asian and Antarctic climate changes. This provides the robust evidence of a link between northern and southern hemisphere climates that operates through changes in atmospheric circulation. We find that the weakest monsoon closely associated with the warmest Antarctic event always occurred during the Terminations. This finding, along with similar shifts in the opal flux record, suggests that millennial-scale events play a key role in driving the deglaciation through positive feedbacks associated with enhanced upwelling and increasing CO2.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Hubbard, Judith
Almeida, Rafael
Foster, Anna
Sapkota, Soma Nath
Bürgi, Paula
Tapponnier, Paul
format Article
author Hubbard, Judith
Almeida, Rafael
Foster, Anna
Sapkota, Soma Nath
Bürgi, Paula
Tapponnier, Paul
author_sort Hubbard, Judith
title Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
title_short Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
title_full Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
title_fullStr Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
title_full_unstemmed Structural segmentation controlled the 2015 Mw 7.8 Gorkha earthquake rupture in Nepal
title_sort structural segmentation controlled the 2015 mw 7.8 gorkha earthquake rupture in nepal
publishDate 2019
url https://hdl.handle.net/10356/85233
http://hdl.handle.net/10220/50430
_version_ 1681058747375419392